Does ETABS calculate period according to UBC 97 eq. 30-8?

Answer: When the option for UBC 97 is selected, the structural period used for auto-seismic load calculation is determined through one of the following methods:

Method A

According to the mode with the largest participation factor along that orientation.

User-defined parameters

While ETABS does not use UBC 97 eq. 30-10 to calculate structural period, a properly substantiated analysis model should produce a period suitable for drift calculations. The ETABS Lateral Loads Manual provides additional information.

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